KR20180063745A - Power saving type hook-on electronic power meter - Google Patents

Abstract

The present invention relates to a hook-on power saving watt-hour meter having a non-contact structure without a terminal plate. The hook-on power saving watt-hour meter comprises: a clamp current transform (CT) sensor installed to be detachable on a transmission line or a distribution line, and detecting a current flowing in the line by an electromagnetic induction method; a control module for converting the current detected by the clamp CT sensor into a digital value, and storing the digital value; and a display module for displaying the digital value converted by the control module on a screen.

Description

POWER SAVING TYPE HOOK-ON ELECTRONIC POWER METER

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a watt-hour meter, and more particularly, to a hook-

In general, houses, apartments, buildings, and factories are equipped with a watt-hour meter to measure the power consumption. The watt-hour meter is divided into a mechanical watt-hour meter and an electronic watt-hour meter.

Electronic watt-hour meter is more reliable than meter-driven watt-hour meter because it does not have mechanical moving parts compared to mechanically-constructed watt-hour watt-hour meter, and has advantages of miniaturization through circuit integration. These electronic watt-hour meters consist of body, front cover, terminal block and terminal cover.

In the conventional watt-hour meter, more than 4000 failures or fires occur frequently due to contact failure or breakage of this portion by connecting the input / output terminal block to the terminal block. In addition, since the meter's instructions are continuously displayed and changed during the meter reading, there is a problem that it is difficult to read the desired value at one time. To this end, it takes about 15 minutes or more for the meter probe to take a meter reading.

In addition, since most electronic watt-hour meters are built-in with a current transformer (CT) sensor built in the apparatus, it is not easy to judge whether the CT sensor is malfunctioning or the power source must be shut off to replace the CT sensor And civil complaints occur frequently.

In addition, the conventional watt-hour meters are difficult to apply to various parts due to the large size of the main body, and it is difficult to install the breaker on the switchboard due to its size, and it is not easy to manufacture a large-capacity meter. In addition, since the watt-hour meter is exposed to the outside, the transparency is rapidly reduced due to the generation of ultraviolet rays due to sunlight. Accordingly, the demand for replacing the bad gauge box is rapidly increased and additional costs are incurred due to the replacement.

Especially, in the case of a single gauge box exposed to the outside most, it is impossible to glance through the meter window due to the attack of an animal or an artificial destruction of a human being, and a uniform rectangular design This causes a sense of heterogeneity.

Therefore, there is a need for development of a watt-hour meter capable of miniaturization design of the apparatus, minimizing the meter reading time, and replacing the power meter without shutting off the power supply in case of failure.

Accordingly, it is an object of the present invention to provide a hook-type power saving type watt hour meter having a non-contact type structure without a terminal block.

It is another object of the present invention to provide a hook-on type power saving type watt hour meter capable of shortening the meter reading time of a meter by applying a CT structure of a hook-on type to a current detection system of a watt hour meter and displaying a temporary meter reading element.

It is also an object of the present invention to provide a hook-type power saving type watt hour meter capable of implementing a smart grid (intelligent power grid) by displaying a variety of essential metering elements such as appearance, validity, invalidity, maximum power and overcurrent and maximum current in a watt- .

It is another object of the present invention to provide a hook-and-type power saving type watt hour meter which can be applied to various parts such as an electric distribution panel and a distribution panel by separating and modularizing the control module main body, the LCD display device, the clamp type CT,

According to an aspect of the present invention, there is provided a hook-type power saving watt-hour meter including: a clamp CT (current) detecting unit for detecting a current flowing through the line by an electromagnetic induction method, transfomer sensors; A control module for converting the current detected by the clamp CT sensor into a digital value and storing the digital value; And a display module for displaying the digital value converted by the control module on a screen.

Preferably, the clamp CT sensor comprises: an upper frame formed to support an upper core of two separated cores; A lower frame formed to support a lower core among the two separated cores; A hinge having the upper frame and the lower frame pivotally coupled to each other; And fastening means for fastening the cores to each other on one side of each frame.

Preferably, the fastening means comprises: a fastening hole formed on one side of the upper frame; And a locking protrusion formed on one side of the lower frame, wherein the locking protrusion and the locking hole are inserted and coupled with each other.

Preferably, the clamp CT sensor has a coupling protrusion formed on a surface of the upper frame that contacts the lower frame, and a coupling groove is formed in a surface of the lower frame corresponding to the coupling protrusion formed on the upper frame.

Preferably, the clamp CT sensor is characterized in that the engaging projection is seated in the engaging groove when the upper frame and the lower frame are hook-on-engaged by the engaging means.

Preferably, the control module includes: a measurement unit for measuring a current value sensed from the clamp CT sensor; A signal converter for converting the analog measurement value measured by the measurement unit into a digital value; And a controller for storing the converted value in the signal converting unit or controlling the display unit to display the converted value.

Preferably, the control module further includes a timer unit for counting a time corresponding to a predetermined condition according to a control signal of the control unit. When the control unit is set to the power saving mode, The operation mode is switched to the power saving mode.

Preferably, the control module controls the timer to be driven when the meter-reading button is turned on through the control module.

According to the present invention, convenience and efficiency can be improved by applying a communication, control fusion and fusion technique to a watt-hour meter and applying a digital miniaturization technique.

Further, the watt hour meter according to the present invention can be installed in a place where it is needed without space limitation, and it is possible to improve the work efficiency and reduce the fatigue of the worker by shortening the meter reading time of the meter reader.

FIG. 1 is a view showing the construction of a hook-type power saving type watt hour meter according to an embodiment of the present invention.
2 is a view showing a connection relationship of a hook-type power saving type watt hour meter according to an embodiment of the present invention.
3 is a perspective view of a display module according to an embodiment of the present invention.
4 is an exploded perspective view of a display module according to an embodiment of the present invention.
FIG. 5 is an exemplary view of a display screen configuration according to an embodiment of the present invention.
6 is a block diagram illustrating a detailed configuration of a control module according to an embodiment of the present invention.
7 is a flowchart showing a control procedure in the control module according to the embodiment of the present invention.
8A, 8B and 8C are perspective views of a clamp CT sensor according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which the claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition, terms in common use in the context of the present invention are not ideally or excessively interpreted unless expressly defined.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

FIG. 1 is a view showing the construction of a hook-type power saving type watt hour meter according to an embodiment of the present invention. Referring to FIG. 1, a hook-type power saving watt-hour meter according to an embodiment of the present invention includes a clamp CT (current transfomer) for detachably mounting on a transmission or distribution line and detecting a current flowing through the line by an electromagnetic induction method, A sensor 120, and a control module 100 for converting the current detected from the clamp CT sensor 120 into a digital value and storing the digital value. The control module 100 may include a display unit 110 for converting a meter reading result into a digital value, and the display unit may be a separate display module.

The clamp CT sensor 120 and the control module 100 may be implemented as separate miniature modules as shown. In addition, the CT can be realized as a clamp type of detachable type with no terminal, so that the design can be downsized, it can be installed inside the switchgear, and it can be more effective in measuring large capacity power. In addition, the clamp CT sensor 120 adopts a clamping method instead of a terminal to connect to a wire, so that there is no terminal block, so that problems such as poor contact, deterioration, and disconnection in the terminal can be prevented in advance.

That is, the clamp CT sensor 120 may be a detachable clamp type without a terminal, and may be detachably attached to an electric wire requiring current measurement, and may have a clamp-type hook-on structure to facilitate fastening. The detailed structure of the clamp CT sensor 120 will be described later in the description of FIG.

The current sensed through the clamp CT sensor 120 may be provided to the controller 100, which is configured as a separate module through the connection line 130. The controller 100 detects the amount of current from the value provided from the clamp CT sensor 120 and calculates the detected power value to calculate the active power, the reactive power, the apparent power, the maximum power, etc., It can be displayed digitally.

In addition, according to various embodiments of the present invention, the meter reading operation time can be minimized by causing the display unit 110 to temporarily display a predetermined value in the form of a stop value at the time of meter reading.

The control device 100 may store or process the value provided from the clamp CT sensor 120 and may transmit the stored or processed data to other external devices through the connection line 140 or the wireless communication means have.

2 is a view showing a connection relationship of a hook-type power saving type watt hour meter according to an embodiment of the present invention. Referring to FIG. 2, the watt-hour meter according to the embodiment of the present invention may be implemented as two or more independent modules. For example, a clamp CT sensor, a main board, and an LCD can be implemented as separate modules. By doing this, the watt hour meter can be downsized and can be easily replaced.

FIG. 3 is a perspective view of a display module according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view of a display module according to an embodiment of the present invention. 3 and 4, the watt-hour meter according to the embodiment of the present invention may implement a display module separately from the control module.

For example, the display module can be fastened to the case body by the fastening means, and the display module can be easily installed by simplifying the size by including only the LCD module in the case. This makes it possible for the meter reader to facilitate meter reading.

FIG. 5 is an exemplary view of a display screen configuration according to an embodiment of the present invention. Referring to FIG. 5, various information related to a watt-hour meter can be processed and displayed in a display module according to various embodiments of the present invention.

The display screen shown in FIG. 5 may be configured as shown in Table 1 below.

No division One Item number 2 Measurand indicator 3 Error indicator 4 Memory Fault Indicator 5 Battery Error Indicator 6 Communication indicator 7 Security indicator 8 Unit indicator 9 Power factor unit indicator 10 Upper limit display and rotation indicator 11 TOU time zone indicator 12 Test indicator 13 Load control indicator 14 The corresponding phase- 15 Current limit indicator

In addition, each of the display items described in Table 1 can be expressed as shown in Table 2 below. The items shown in Fig. 5 are in accordance with various embodiments of the present invention and can be modified or reconfigured in various forms.

No division Contents Example of operation One Item number Turning order of LCD circulation items 2 Measurand indicator Display measurement information 3 Error indicator Lights up when self-diagnosis error occurs Error 4 Memory Fault Indicator Flashing in case of memory error NEM 5 Battery Error Indicator Blinking when no battery BAT 6 Communication indicator Flashing during communication Icon blinking 7 Security indicator Flashing in case of security error Icon blinking 8 Unit indicator Unit display of measurand indicator Kw, kVA, kvar, kWh, Kva, kVAh, Hz, V, A 9 Power factor unit indicator Display of power factor and harmonic ratio % 10 Upper limit display and rotation indicator Display of upper limit and load operation Rotation indicator: clockwise rotation (reception), counterclockwise rotation (transmission)
High limit display: Lights up 11 TOU time zone indicator Time zone lit, flashing Time zone flashing 12 Test indicator Test mode TEST lights 13 Load control indicator Illuminates and flickers according to load opening and closing Load ON LOAD ^O
Load off LOAD _X 14 The corresponding phase- Corresponding phase blinking Flashing during phase 15 Current limit indicator Lit according to current limit, flashing CL on current limit operation
CL flashing for permanent blocking

6 is a block diagram illustrating a detailed configuration of a control module according to an embodiment of the present invention. 6, a control module 100 according to an embodiment of the present invention includes a control unit 610, a display unit 620, a mode determination unit 630, a timer unit 640, a storage unit 650, A measurement unit 670, and a communication unit 680. The measurement unit 670,

According to various embodiments of the present invention, the value sensed via the clamp CT sensor 120 may be received via the measurement unit 670. [ For example, the measurement unit 670 may measure the current value sensed from the clamp CT sensor 120. [ The signal converting unit 660 converts the analog measurement value received through the measuring unit 670 into a digital value.

The control unit 610 may store the measurement value converted into the digital value in the storage unit 650. The control unit 610 may process the received value to generate various data, store the generated data in the storage unit 650, or display the generated data in real time through the display unit 620. [

In addition, according to various embodiments of the present invention, the display unit 620 maintains the off state for power saving, and when the meter reading request of the meter (for example, when the meter reading button is input) Data can be displayed. Also, the data displayed through the display unit 620 may be displayed through the timer unit 640 for a preset time, and then turned off.

The mode determination unit 630 determines various modes stored in the storage unit 650 according to the user's setting and the controller 610 controls the data to be displayed on the display unit 620 according to the set mode. For example, when the power saving mode is set in the control module 100, the meter determiner 630 may determine that the power saving mode is selected and display data only for a preset time when the meter probe requests the meter reading.

The timer 640 counts a time corresponding to a preset condition according to a control signal of the controller 610. When the controller 610 is set in the power saving mode, When the time elapses, it is possible to control the operation mode to the power saving mode. In addition, the control module 100 may control the timer unit 640 to be driven when the meter reading button is turned on through the control module 100.

According to various embodiments of the present invention, the control module 100 may implement remote reading and remote control through the communication unit 680. At this time, the external modem power is supplied from a meter, and the supplied voltage and capacity may be, for example, DC 12V (± 5%), 2.5VA. It is possible to read the metering information recorded in the meter through the communication line remotely, such as the meter reading center, through the communication unit 680, and to implement software upgrading and time synchronization at a higher level. The software upgrade information may be stored in the storage unit 650.

The control module 100 of the watt hour meter can be implemented so that all the LP data (6,240 or more) can be transmitted within 15 minutes from the LP data request time of the operating program or the upper system. The maximum packet size of the data is 128 bytes . The communication unit 680 may be designed to be connected between the meter and the modem by using a pin connection type connector, and the meter and the modem may be implemented using an RS485 communication method which is insulated. When the modem is installed, the Modem LED (3.3V operating voltage) on the front left side of the instrument may be lit in 'green'. In addition, it is possible to transmit the power failure signal to the modem when a power failure occurs.

Although not clearly shown, the devices shown in Fig. 6 may further include components not shown in Fig. 6 or may not include some components shown in Fig. Also, as shown in Fig. 6, some of the components may be separated into a plurality of detailed components, or a plurality of components may be provided by being combined into one component.

In the meantime, the respective components of the apparatus are separately shown in the drawings to show that they can be functionally and logically separated, and do not necessarily mean physically separate components or separate codes.

In this specification, each functional unit (or module) may mean a functional and structural combination of hardware for carrying out the technical idea of the present invention and software for driving the hardware. For example, each functional unit may refer to a logical unit of a predetermined code and a hardware resource for executing the predetermined code, and may be a code physically connected to the functional unit, But can be easily deduced to the average expert in the field of the invention.

The invention has been described above with the aim of method steps illustrating the performance of certain functions and their relationships. The boundaries and order of these functional components and method steps have been arbitrarily defined herein for convenience of description. Alternative boundaries and sequences may be defined as long as the specific functions and relationships are properly performed. Any such alternative boundaries and sequences are therefore within the scope and spirit of the claimed invention. In addition, the boundaries of these functional components have been arbitrarily defined for ease of illustration. Alternative boundaries can be defined as long as certain important functions are properly performed. Likewise, the flow diagram blocks may also be arbitrarily defined herein to represent any significant functionality. For extended use, the flowchart block boundaries and order may have been defined and still perform some important function. Alternative definitions of both functional components and flowchart blocks and sequences are therefore within the scope and spirit of the claimed invention.

7 is a flowchart showing a control procedure in the control module according to the embodiment of the present invention. Referring to FIG. 7, when the power saving mode is set 710 in the control module 100, the mode setting information may be stored in the storage unit.

At this time, when the meter reading button is turned on (720) by the meter, the MCU operation mode can be switched (730). The control module 100 receives the pulse signal sensed from the clamp CT sensor 740, converts the sensed pulse signal into a digital value, and displays it on the screen (750).

When the timer is operated and the set time has elapsed (760) as the meter button is turned on, the MCU operation mode is switched to the MCU power saving mode (770).

At least one of the operations shown in FIG. 7 may be omitted and at least one other operation may be added between the operations. 7 may be processed in the order shown, and the execution order for at least one operation may be modified and processed in accordance with the execution order of the other operation. In addition, the operations shown in FIG. 8 may be performed in the electronic device, or may be performed in the server. Also, at least one of the operations shown in FIG. 7 may be performed in the electronic device, and the remaining operations may be implemented in the server.

Meanwhile, the method according to an embodiment of the present invention may be implemented in the form of a program command which can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

8A, 8B and 8C are perspective views of a clamp CT sensor according to an embodiment of the present invention. Referring to FIGS. 8A, 8B, and 8C, the clamp CT sensor 120 according to various embodiments of the present invention may be divided into an upper frame 820 and a lower frame 810.

The upper frame 820 is formed to support the upper core among the two separated cores, and the lower frame 810 is formed to support the lower core out of the two separated cores. The upper frame 820 and the lower frame 810 may be pivotally coupled to each other using a hinge unit 850.

In addition, according to the embodiment of the present invention, the clamp CT sensor 120 may include fastening means for fastening the respective cores to one side of each frame. For example, the fastening means includes a fastening hole 830 formed at one side of the upper frame 820 and a fastening protrusion 840 formed at one side of the lower frame 810, The holes 830 may be configured to be inserted and coupled with each other.

According to an embodiment of the present invention, the clamp CT sensor 120 may have a coupling protrusion 860 formed on a surface of the upper frame 820 that contacts the lower frame 810, A coupling groove 870 may be formed in a surface corresponding to the coupling protrusion 860 formed in the upper frame 820.

Accordingly, when the upper frame 820 and the lower frame 810 are hook-on-coupled by the fastening means, the fastening protrusion 860 is seated in the fastening groove 870 The positions of the upper frame 820 and the lower frame 81 may be fixed.

As has been described above, specific combinations of configurations or steps of the present invention have been described in detail by way of the above embodiments, but other combinations of such configurations and steps are likewise possible. The present invention is not limited to the specific embodiments disclosed herein, and such other combinations are within the scope of the present invention. Therefore, the present invention is not limited to the above-described embodiments, and various modifications and changes may be made thereto by those skilled in the art to which the present invention belongs.

100: control module 110: display
120: clamp CT sensor 130: connection line
140: connection line 610:
620: Display unit 630:
640: timer section 650: storage section
660: Signal converting section 670: Measuring section
680: communication unit 810:
820: upper frame 830: fastening hole
840: Jaw 850: Hinge
860: engaging projection 870: engaging groove

Claims (8)

In a hook-type power saving type watt hour meter,
A clamp CT (current transfomer) sensor detachably mounted on the transmission or distribution line for detecting a current flowing through the line by an electromagnetic induction method;
A control module for converting the current detected by the clamp CT sensor into a digital value and storing the digital value; And
And a display module for displaying the digital value converted by the control module on a screen.
The apparatus of claim 1, wherein the clamp CT sensor comprises:
An upper frame formed to support an upper core of two separated cores;
A lower frame formed to support a lower core among the two separated cores;
A hinge having the upper frame and the lower frame pivotally coupled to each other; And
And a fastening means for fastening the cores to each other on one side of each frame.
3. The apparatus according to claim 2,
A fastening hole formed on one side of the upper frame; And an engagement protrusion formed on one side of the lower frame,
And the hooking jaw and the fastening hole are inserted and coupled with each other.
The apparatus of claim 3, wherein the clamp CT sensor comprises:
Wherein a coupling protrusion is formed on a surface of the upper frame in contact with the lower frame and a coupling groove is formed in a surface of the lower frame corresponding to the coupling protrusion formed on the upper frame.
The apparatus of claim 4, wherein the clamp CT sensor comprises:
Wherein the engaging projection is seated in the engaging groove when the upper frame and the lower frame are hook-on-engaged by the engaging means.
The apparatus of claim 1,
A measuring unit for measuring a current value sensed from the clamp CT sensor;
A signal converter for converting the analog measurement value measured by the measurement unit into a digital value; And
And a control unit for storing the converted value in the signal conversion unit or for controlling the display unit to display the converted value in the storage unit.
7. The apparatus of claim 6,
And a timer unit for counting a time corresponding to a preset condition according to a control signal of the control unit,
Wherein the control unit switches the mode from the operation mode to the power saving mode when a predetermined time elapses through the timer unit when the power saving mode is set.
8. The apparatus of claim 7,
And controls the timer unit to be driven when the meter reading button is turned on through the control module.

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